I am both an EOS and Alpha user.
All i can say is that the 7D produces much accurate AWB than the a500 under daylight and florescent conditions. Although it is an unfair comparison as Sony currently does not have any semi-pro models.
Are you kidding me? Sony already had and currently have semi-pro models like the a700, a850 and the a900.
I've used Sony, Fuijifilm, Nikon and Canon dSLRs. so far, imo, the Sony a850/a900 and the Fuiji S5 Pro's colour reproduction and AWB accuracy under various conditions is :thumbsup: